LXI bus with high speed, flexibility and other characteristics, has been widely used in instrumentation, and how to upgrade the PXI bus device LXI bus equipment quickly become an urgent problem to be solved. This paper introduces three methods to control the PCI interface device by network: the network communication and command parsing based on SCPI, the network communication and command parsing based on register, and the implementation of the remote procedure call (RPC). Through the analysis and comparison, using RPC method, the driver and soft panel code do not need to do the basic change in any business, can be used directly, to the fastest speed update software, inherited the best and applied this method to the LXI multi channel digital parallel test module project, project successfully passed the acceptance, achieved good results.